# MySQL вернула пустой результат

CREATE TABLE IF NOT EXISTS `albums` (
  `album_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `album_name` varchar(40) NOT NULL,
  `album_date` date DEFAULT NULL,
  `artist_id` int(10) UNSIGNED DEFAULT NULL,
  PRIMARY KEY (`album_id`),
  KEY `artist_id` (`artist_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
CREATE TABLE IF NOT EXISTS `artists` (
  `artist_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `artist_name` varchar(40) NOT NULL,
  PRIMARY KEY (`artist_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
CREATE TABLE IF NOT EXISTS `genres` (
  `genre_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `genre_name` varchar(40) NOT NULL,
  PRIMARY KEY (`genre_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
CREATE TABLE IF NOT EXISTS `styles` (
  `style_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `style_name` varchar(40) NOT NULL,
  PRIMARY KEY (`style_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
CREATE TABLE IF NOT EXISTS `tracks` (
  `track_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `track_patch` text NOT NULL,
  `track_time` time DEFAULT NULL,
  `track_name` varchar(40) NOT NULL,
  `style_id` int(10) UNSIGNED DEFAULT NULL,
  `genre_id` int(10) UNSIGNED DEFAULT NULL,
  `album_id` int(10) UNSIGNED NOT NULL,
  PRIMARY KEY (`track_id`),
  KEY `album_id` (`album_id`),
  KEY `style_id` (`style_id`),
  KEY `genre_id` (`genre_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
CREATE TABLE IF NOT EXISTS `users` (
  `user_id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `login` varchar(40) NOT NULL,
  `password` varchar(40) NOT NULL,
  `registration_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
 
ALTER TABLE `albums`
  ADD CONSTRAINT `FK_albums_artist_id` FOREIGN KEY (`artist_id`) REFERENCES `artists` (`artist_id`) ON DELETE CASCADE ON UPDATE CASCADE;
 
ALTER TABLE `tracks`
  ADD CONSTRAINT `FK_tracks_album_id` FOREIGN KEY (`album_id`) REFERENCES `albums` (`album_id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `FK_tracks_style_id` FOREIGN KEY (`style_id`) REFERENCES `styles` (`style_id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `FK_tracks_genre_id` FOREIGN KEY (`genre_id`) REFERENCES `genres` (`genre_id`) ON DELETE CASCADE ON UPDATE CASCADE;